rseetham commented on code in PR #18501:
URL: https://github.com/apache/pinot/pull/18501#discussion_r3283874821
##########
pinot-controller/src/main/java/org/apache/pinot/controller/validation/RealtimeOffsetAutoResetManager.java:
##########
@@ -105,36 +112,81 @@ protected void processTable(String tableNameWithType,
RealtimeOffsetAutoResetMan
return;
}
+ // Skip triggering if the controller is already handling the maximum
number of concurrent backfills
+ int maxConcurrent =
_controllerConf.getMaxConcurrentBackfillsPerController();
+ if (context._shouldTriggerBackfillJobs && maxConcurrent > 0
+ && _tableBackfillTopics.size() >= maxConcurrent) {
+ LOGGER.warn("Skipping backfill trigger for table {} — max concurrent
backfills ({}) reached",
+ tableNameWithType, maxConcurrent);
+ _controllerMetrics.addMeteredTableValue(tableNameWithType,
+ ControllerMeter.OFFSET_AUTO_RESET_BACKFILL_SKIPPED_MAX_CONCURRENT,
1L);
+ context._shouldTriggerBackfillJobs = false;
+ }
+
if (context._shouldTriggerBackfillJobs) {
_tableTopicsUnderBackfill.putIfAbsent(tableNameWithType,
ConcurrentHashMap.newKeySet());
String topicName =
context._backfillJobProperties.get(Constants.RESET_OFFSET_TOPIC_NAME);
+ String partitionStr =
context._backfillJobProperties.get(Constants.RESET_OFFSET_TOPIC_PARTITION);
_tableTopicsUnderBackfill.get(tableNameWithType).add(topicName);
+ // Per-partition in-flight guard: _tableBackfillTopics contains the
backfill Kafka topic names
+ // (not the main topic names), so any non-empty set indicates a backfill
is already in flight.
+ // Track collisions per (table, topic, partition); auto-pause if
collisions exceed the threshold.
+ String partitionKey = tableNameWithType + ":" + topicName + ":" +
partitionStr;
+ Set<String> activeBackfillTopics =
_tableBackfillTopics.get(tableNameWithType);
+ boolean anyBackfillInFlight = activeBackfillTopics != null &&
!activeBackfillTopics.isEmpty();
Review Comment:
I made this more complicated than it needs to be. I only need to check
collisions per partition, so I removed that check altogether now. Thanks for
pointing it out.
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